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When a block has no terminator instructions, getFirstTerminator() returns end(), which can't be used in dominance checks. Check dominance for phi operands separately. Also, remove some bits from WebAssemblyRegStackify.cpp that were causing trouble on the same testcase; they were left behind from an earlier experiment. Differential Revision: http://reviews.llvm.org/D15210 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254662 91177308-0d34-0410-b5e6-96231b3b80d8
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